The rationale to diversify and add value has seen Ernslaw One expand processing capabilities into a full vertically integrated softwood product company via the purchase and integration of wood processing entities such as Winstone Pulp International Ltd.  These facilities have all been integrated under the WPI brand and form the processing arm of Ernslaw's forestry activities.

More recently Ernslaw One has looked towards more efficient utilisation of its forestry by-products and is promoting the benefits of sustainable wood products in the energy industry through its residue supply relationship with Wood Energy NZ.